Filling The Heating System - Viessmann VITOLADENS 300-W Installation And Service Instructions Manual

Further details regarding the individual steps

Filling the heating system

Fill water
!
Please note
Unsuitable fill water increases
the level of deposits and corro-
sion and may lead to boiler dam-
age.
■ Flush the heating system thor-
oughly before filling.
■ Only use fill water of potable
quality.
Total permissible hardness of the fill and top-up water
Total heating
output
kW
≤ 50
> 50 to ≤ 200
> 200 to ≤ 600
> 600
1. Check the pre-charge pressure of the
diaphragm expansion vessel.
Specific system volume
< 20 l/kW
3
≤ 3.0 mol/m
(16.8 °dH)
3
≤ 2.0 mol/m
(11.2 °dH)
≤ 1.5 mol/m 3
(8.4 °dH)
< 0.02 mol/m 3
(0.11 °dH)
Commissioning, inspection, maintenance
(cont.)
■ An antifreeze additive suitable
for heating systems can be
added to the fill water. The anti-
freeze manufacturer must ver-
ify its suitability.
■ Fill and top-up water with a
water hardness in excess of
the following values must be
softened, e.g. with a small soft-
ening system for heating water.
≥ 20 l/kW to
< 50 l/kW
3
≤ 2.0 mol/m
(11.2 °dH)
3
≤ 1.5 mol/m
(8.4 °dH)
≤ 0.02 mol/m 3
(0.11 °dH)
< 0.02 mol/m 3
(0.11 °dH)
A
≥ 50 l/kW
3
< 0.02 mol/m
(0.11 °dH)
3
< 0.02 mol/m
(0.11 °dH)
< 0.02 mol/m 3
(0.11 °dH)
< 0.02 mol/m 3
(0.11 °dH)
25